the "or" you are using is not valid syntax for creating a query with SQLAlchemy. I'm guessing the space was causing the latter portions of the query (including the ordering and the limiting) to be ignored.
I replaced your ORs with an SQL "in" query an it seems to work for me:
num_stocks = 500
fundamental_df = get_fundamentals(
# put your query in here by typing "fundamentals."
fundamentals.asset_classification.growth_score, # 0 to 100
fundamentals.asset_classification.value_score, # 0 to 100
fundamentals.asset_classification.growth_grade, # A,B,C,D,E,F
fundamentals.asset_classification.financial_health_grade, # A,B,C,D,E,F
fundamentals.asset_classification.profitability_grade # A,B,C,D,E,F
.filter(fundamentals.valuation.market_cap != None)
.filter(fundamentals.valuation.shares_outstanding != None)
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